pushUniqueObject in array

function pushUniqueObject(...arrays) {
  let result = [];
  let uniqueId = [];
  for(let array of arrays) {
    if(array.length !== 0) {
      for (let object of array) {
        if(object.child_id !== undefined && !uniqueId[object.child_id]) {
          uniqueId[object.child_id] = true;
          result.push(object);
        }
      }
    }
  }
  return result;
};